Emerson 1F97-1277 Manuel De Montage

Reset Operation 

Note: When thermostat is reset, installer configuration menu settings and programming will reset to factory settings. 

If a voltage spike or static discharge blanks out the display or causes erratic thermostat operation, you can reset the thermostat by removing 

the wires from terminals R and C (do not short them together) and removing batteries for 2 minutes . After resetting the thermostat, replace the 

wires and batteries . If the thermostat has been reset and still does not function correctly contact your heating/cooling service person or place 

of purchase .  

White-Rodgers is a business 
of Emerson Electric Co.

The Emerson logo is a  
trademark and service mark 
of Emerson Electric Co.

1 . Blown fuse or tripped circuit breaker . 

2 . Furnace power switch to OFF . 

3 . Furnace blower compartment door or 

  panel loose or not properly installed . 

4 . Loose connection to thermostat or system .

Replace fuse or reset breaker . 

Turn switch to ON . 

Replace door panel in proper position to engage 

safety interlock or door switch . 

Tighten connections .

1 . Pilot light not lit . 

2 . Furnace Lock-Out Condition . Heat 

  may also be intermittent . 

 

 

3 . Heating system requires service or 

  thermostat requires replacement .

Re-light pilot . 

Many furnaces have safety devices that shut down 

when a lock-out condition occurs . If the heat works 

intermittently contact the furnace manufacturer or 

local HVAC service person for assistance . 

Diagnostic: Set SYSTEM Switch to HEAT and 

raise the setpoint above room temperature . Within 

a few seconds the thermostat should make a soft 

click sound . This sound usually indicates the ther-

mostat is operating properly . If the thermostat does 

not click, try the reset operation listed above . If the 

thermostat does not click after being reset contact 

your heating and cooling service person or place of 

purchase for a replacement . If the thermostat clicks, 

contact the furnace manufacturer or a HVAC service 

person to verify the heating is operating correctly .

1 . Cooling system requires service or 

  thermostat requires replacement .

Same as diagnostic for No Heat condition except 

set the thermostat to 

COOL and lower the setpoint 

below the room temperature . There may be up to 

a five minute delay before the thermostat clicks in 

Cooling .

1 . Possible short in wiring . 

2 . Possible short in thermostat . 

3 . Possible short in heat/cool/fan system . 

4 . FAN Switch set to Fan 

ON . 

Check each wire connection to verify they are not 

shorted or touching together . No bare wire should 

stick out from under terminal block . Try resetting 

the thermostat as described above . If the condition 

persists the manufacturer of your system or service 

person can instruct you on how to test the Heat/

Cool system for correct operation . If the system 

operates correctly, replace the thermostat .

1 . Thermostat thermometer setting 

  requires adjustment .

The thermometer can be adjusted +/- 4 degrees . 

See Temperature Display Adjustment in the Con-

figuration Menu section.

1 . The location of the thermostat and/or 

  the size of the Heating System may 

  be influencing the cycle rate. 

Digital thermostats provide precise control and 

cycle faster than older mechanical models . The 

system turns on and off more frequently but runs for 

a shorter time so there is no increase in energy use . 

If you would like an increased cycle time, choose 

SL for slow cycle in the Configuration menu, step 7 

(heat) or 8 (cool) . If an acceptable cycle rate is not 

achieved, contact a local HVAC service person for 

additional suggestions .

Press the menu button (button will disappear) and 

hold in for 20 seconds . This unlocks the thermostat .

Earlier model of thermostat refer to 37-6814D .